The Collaborative International Dictionary of English v.0.48:

D'ebris \D['e]`bris"\, n. [F., fr. pref. d['e]- (L. dis) +
   briser to break, shatter; perh. of Celtic origin.]
   1. (Geol.) Broken and detached fragments, taken collectively;
      especially, fragments detached from a rock or mountain,
      and piled up at the base.
      [1913 Webster]

   2. Rubbish, especially such as results from the destruction
      of anything; remains; ruins.
      [1913 Webster]

WordNet (r) 3.0 (2006):

debris
    n 1: the remains of something that has been destroyed or broken
         up [syn: debris, dust, junk, rubble, detritus]